A heating coil is arranged inside an iron cylinder of base radius 3.5 m and height 6.5 cm. The radiating surface of the cylinder is

(Take pi= $\frac{22}{7}$ )

120 sq. cm

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220 sq. cm

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320 sq. cm

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240 sq. cm

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Solution

The correct option is B
220 sq. cm

Total radiated area = Total surface area

= 2 π r(r+h)= 220 sq. cm

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